Synthesis of AlN Powder from Precipitation Precursor by Carbon Thermal Reduction in Flowing Nitrogen
| Periodical | Key Engineering Materials (Volumes 512 - 515) |
|---|---|
| Main Theme | High-Performance Ceramics VII |
| Edited by | Wei Pan and Jianghong Gong |
| Pages | 24-27 |
| DOI | 10.4028/www.scientific.net/KEM.512-515.24 |
| Citation | Hui Feng Lu et al., 2012, Key Engineering Materials, 512-515, 24 |
| Online since | June, 2012 |
| Authors | Hui Feng Lu, Ming Li Qin, Sui He Jiang, Ai Min Chu, Yan Zhang, Xuan Hui Qu |
| Keywords | Aluminum Nitride (AlN), Carbon Remove, Carbonthermal Reduction, Precipitation |
| Price | US$ 28,- |
Abstract. Aluminum nitride(AlN) powders were synthesized by carbonthermal reduction of Ammonium aluminum carbonate hydroxide(AACH). The AACH were prepared from ammonium alum and ammonium hydrogen carbonate by precipitation method and AACH adhere to carbon black during precipitation. The precursor has a high reaction activity (near 100% of nitridation ratio after heated in flow nitrogen at 1400C, 2h). After carbon remove in muffle furnace at 700 C, white color Aluminum nitride (AlN) powder attained and mean size is 100 nm. The specific surface area of the powders decreased with increasing of concentration of ammonium alum and ammonium hydrogen carbonate, which range from 22 m2/g to 7 m2/g, particle size vary from 58 to 120 nm. Phase presents in the products during heating in flowed nitrogen were observed by X-ray diffraction. The -Al2O3 formed when the precursor heated to 1200C, AlN was founded at 1300C and the reaction ended at 1400C, the reaction temperature and annealing time were much lower than nitridate the mixture of Al2O3 and carbon black. Particle size was increased when reaction temperature increased from 1400C to 1550C.
